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Shells in OCaml
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12345678910111213141516171819type 'a t(** A functional stack *)
val push : 'a -> 'a t -> 'a t(** Push a new element to the stack. *)
val pop : 'a t -> ('a * 'a t) option(** Pop an element from the stack, and the new smaller stack. Returns [None] if the stack is empty. *)
val peek : 'a t -> 'a option(** Peek at the top of the stack. *)
val to_list : 'a t -> 'a list(** Converts a stack to a list. *)
val empty : 'a tval pp : 'a Fmt.t -> 'a t Fmt.t